Big Three of World War I: Georges Clemenceau, David Lloyd George, Woodrow Wilson were known as "The Big Three" of World War I. "The Big Three" refers to the leaders of the three key allies during World War I: Georges Clemenceau of France, David Lloyd George of England, and Woodrow Wilson of the United States.
Black Hand: Gavrilo Princip was a young Yugoslav nationalist who assassinated Archduke Franz Ferdinand and his wife on June 28, 1914, sparking WWI. Princip petitioned to join Black Hand, a secret military society for unification of Southern Slavic territories, but was rejected. This rejection may have been a personal motive to do something noteworthy.
Battle of Britain: The Battle of Britain was the first major campaign to be fought entirely in the air, pitting the Royal Air Force (RAF) against the German Air Force (Luftwaffe). The bombing of Britain caused many deaths and destruction of historical buildings and artifacts.
Causes of World War II: The rise of Adolf Hitler to power, Germany's invasion of Poland in 1939 and the Treaty of Versailles, which had bankrupted and humiliated Germany and Japan's invasion of Manchuria were causes of World War II. The Suez Crisis occurred after WWII. The Suez Crisis was a 1956 conflict between Egypt and an alliance of Britain, Israel, and France. The aims of the incident were to regain Western control of the Suez Canal and remove the Egyptian president from power. Pressure from the US and USSR at the United Nations would force the three allies to withdraw.
Franco-Prussian War: The most important consequence of the Franco-Prussian War was the unification of Germany into an empire. With a victory over French assured, the German States proclaimed their union as the German Empire, uniting under Prussian king Wilhelm I. Results of the war also included the annexation of Alsace-Lorraine by Germany.
Maginot Line: The Maginot Line was constructed by France along its German border in the lead-up to World War II. The fortification was intended to allow French forces time to mobilize in the event of attack.